package com.sky.service.impl;

import com.sky.dto.GoodsSalesDTO;
import com.sky.entity.Orders;
import com.sky.mapper.OrderMapper;
import com.sky.mapper.UserMapper;
import com.sky.service.ReportService;
import com.sky.service.WorkspaceService;
import com.sky.vo.*;
import lombok.extern.slf4j.Slf4j;
import org.apache.commons.lang3.StringUtils;
import org.apache.poi.xssf.usermodel.XSSFRow;
import org.apache.poi.xssf.usermodel.XSSFSheet;
import org.apache.poi.xssf.usermodel.XSSFWorkbook;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;

import javax.servlet.ServletOutputStream;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;
import java.io.InputStream;
import java.time.LocalDate;
import java.time.LocalDateTime;
import java.time.LocalTime;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import java.util.stream.Collectors;

/**
 * 统计服务实现类
 * @author wzplove
 */
@Service
@Slf4j
public class ReportServiceImpl implements ReportService {

    private static final String TEMPLATE = "template/运营数据报表模板.xlsx";

    @Autowired
    private OrderMapper orderMapper;

    @Autowired
    private UserMapper userMapper;

    @Autowired
    private WorkspaceService workspaceService;

    /**
     * 指定时间内的营业额统计
     * @param begin
     * @param end
     * @return
     */
    @Override
    public TurnoverReportVO getTurnoverStatistics(LocalDate begin, LocalDate end) {
        log.info("营业额统计");
        //存放begin到end内的每天的日期
        List<LocalDate> dateList = new ArrayList<>();
        dateList.add(begin);
        while (!begin.equals(end)) {
            //日期加1,指定日期后一天对应日期
            begin = begin.plusDays(1);
            dateList.add(begin);
        }

        //存放date日期的营业额
        List<Double> turnoverList = new ArrayList<>();
        //查询date日期的营业额
        for (LocalDate date : dateList) {
            //获取date日期的营业额, 状态已完成的订单金额合计
            LocalDateTime beginTime = LocalDateTime.of(date, LocalTime.MIN);
            LocalDateTime endTime = LocalDateTime.of(date, LocalTime.MAX);

            //select sum(amount) from orders where order_time > beginTime and order_time < endTime and status = 5
            Map map = new HashMap<>();
            map.put("begin", beginTime);
            map.put("end", endTime);
            map.put("status", Orders.COMPLETED);
            Double turnover = orderMapper.sumByMap(map);
            turnoverList.add(turnover == null ? 0.0 : turnover);
        }

        return TurnoverReportVO
                .builder()
                .dateList(StringUtils.join(dateList, "，"))
                .turnoverList(StringUtils.join(turnoverList, "，"))
                .build();
    }

    /**
     * 指定时间内的用户统计
     * @param begin
     * @param end
     * @return
     */
    @Override
    public UserReportVO getUserStatistics(LocalDate begin, LocalDate end) {
        //存放begin到end内的每天的日期
        List<LocalDate> dateList = new ArrayList<>();
        dateList.add(begin);
        while (!begin.equals(end)) {
            //日期加1,指定日期后一天对应日期
            begin = begin.plusDays(1);
            dateList.add(begin);
        }
        //存放每天的新增用户数
        List<Integer> newUserList = new ArrayList<>();
        //存放每天的总用户数
        List<Integer> totalUserList = new ArrayList<>();

        for (LocalDate date : dateList) {
            LocalDateTime beginTime = LocalDateTime.of(date, LocalTime.MIN);
            LocalDateTime endTime = LocalDateTime.of(date, LocalTime.MAX);
            Map map = new HashMap<>();
            map.put("end", endTime);
            //总用户数
            Integer totalUser = userMapper.countByMap(map);

            map.put("begin", beginTime);
            //新增用户数
            Integer newUser = userMapper.countByMap(map);

            totalUserList.add(newUser);
            newUserList.add(totalUser);
        }

        //封装数据
        return UserReportVO
                .builder()
                .dateList(StringUtils.join(dateList, "，"))
                .totalUserList(StringUtils.join(totalUserList, "，"))
                .newUserList(StringUtils.join(newUserList, "，"))
                .build();
    }

    /**
     * 指定时间内的订单统计
     * @param begin
     * @param end
     * @return
     */
    @Override
    public OrderReportVO getOrdersStatistics(LocalDate begin, LocalDate end) {
        //存放begin到end内的每天的日期
        List<LocalDate> dateList = new ArrayList<>();
        dateList.add(begin);
        while (!begin.equals(end)) {
            //日期加1,指定日期后一天对应日期
            begin = begin.plusDays(1);
            dateList.add(begin);
        }
        //存放每天订单数
        List<Integer> orderCountList = new ArrayList<>();
        //存放每天有效订单数
        List<Integer> validOrderCountList = new ArrayList<>();

        //遍历集合，查询每天有效的订单数
        for (LocalDate date : dateList) {
            LocalDateTime beginTime = LocalDateTime.of(date, LocalTime.MIN);
            LocalDateTime endTime = LocalDateTime.of(date, LocalTime.MAX);
            //查询每天订单数
            Integer orderCount = getOrderCount(beginTime, endTime, null);
            //查询每天的订单总数
            Integer validOrderCount = getOrderCount(beginTime, endTime, Orders.COMPLETED);

            orderCountList.add(orderCount);
            validOrderCountList.add(validOrderCount);
        }

        //计算订单总数
        Integer totalOrderCount = orderCountList.stream().reduce(Integer::sum).get();
        //计算有效订单总数
        Integer validOrderCount = validOrderCountList.stream().reduce(Integer::sum).get();


        double orderCompletionRate = 0.0;
        if (totalOrderCount != 0) {
            //计算订单完成率
            orderCompletionRate = validOrderCount.doubleValue() / totalOrderCount;
        }

        return OrderReportVO.builder()
                .dateList(StringUtils.join(dateList, "，"))
                .orderCountList(StringUtils.join(orderCountList, "，"))
                .validOrderCountList(StringUtils.join(validOrderCountList, "，"))
                .build();
    }

    /**
     * 销量排名top10
     * @param begin
     * @param end
     * @return
     */
    @Override
    public SalesTop10ReportVO getTop10(LocalDate begin, LocalDate end) {
        LocalDateTime beginTime = LocalDateTime.of(begin, LocalTime.MIN);
        LocalDateTime endTime = LocalDateTime.of(begin, LocalTime.MAX);

        List<GoodsSalesDTO> salesTop10 = orderMapper.getSalesTop10(beginTime, endTime);

        List<String> names = salesTop10.stream().map(GoodsSalesDTO::getName).collect(Collectors.toList());
        String nameList = StringUtils.join(names, "，");

        List<Integer> numbers = salesTop10.stream().map(GoodsSalesDTO::getNumber).collect(Collectors.toList());
        String numberList = StringUtils.join(numbers, "，");

        return SalesTop10ReportVO
                .builder()
                .nameList(nameList)
                .numberList(numberList)
                .build();
    }

    /**
     * 导出运营数据报表
     * @param response
     */
    @Override
    public void exportBusinessData(HttpServletResponse response) {
        //1. 查询数据库，获取营业数据---查询最近30天的运营数据
        LocalDate dateBegin = LocalDate.now().minusDays(30);
        LocalDate dateEnd = LocalDate.now().minusDays(1);

        //查询概览数据
        BusinessDataVO businessData = workspaceService.getBusinessData(LocalDateTime.of(dateBegin, LocalTime.MIN),
                LocalDateTime.of(dateEnd, LocalTime.MAX));

        //2. 通过POI将数据写入到Excel文件中
        InputStream in = this.getClass().getClassLoader().getResourceAsStream(TEMPLATE);

        try {
            //基于模板文件创建一个新的Excel文件
            XSSFWorkbook excel = new XSSFWorkbook(in);
            //获取表格文件的Sheet页
            XSSFSheet sheet = excel.getSheet("Sheet1");
            //填充数据--时间
            sheet.getRow(1).getCell(1).setCellValue("时间：" + dateBegin + "至" + dateEnd);
            //获得第4行
            XSSFRow row = sheet.getRow(3);
            row.getCell(2).setCellValue(businessData.getTurnover());
            row.getCell(4).setCellValue(businessData.getOrderCompletionRate());
            row.getCell(6).setCellValue(businessData.getNewUsers());
            //获得第5行
            row  = sheet.getRow(4);
            row.getCell(2).setCellValue(businessData.getValidOrderCount());
            row.getCell(4).setCellValue(businessData.getUnitPrice());
            //填充明细数据
            for (int i = 0; i < 30; i++) {
                LocalDate date = dateBegin.plusDays(i);
                //查询某一天的营业数据
                BusinessDataVO businessDataVO = workspaceService.getBusinessData(LocalDateTime.of(date, LocalTime.MIN),
                        LocalDateTime.of(date, LocalTime.MAX));
                //获得某一行
                row = sheet.getRow(7 + i);
                row.getCell(1).setCellValue(date.toString());
                row.getCell(2).setCellValue(businessData.getTurnover());
                row.getCell(3).setCellValue(businessData.getValidOrderCount());
                row.getCell(4).setCellValue(businessData.getOrderCompletionRate());
                row.getCell(5).setCellValue(businessData.getUnitPrice());
                row.getCell(6).setCellValue(businessData.getNewUsers());
            }
            //3. 通过输出流将Excel文件下载到客户端浏览器
            ServletOutputStream outputStream = response.getOutputStream();
            excel.write(outputStream);
            //关闭资源
            outputStream.close();
            excel.close();
        } catch (IOException e) {
            e.printStackTrace();
        }
    }

    //获取指定时间内的订单数量
    private Integer getOrderCount(LocalDateTime begin, LocalDateTime end, Integer status) {
        Map map = new HashMap<>();
        map.put("begin", begin);
        map.put("end", end);
        map.put("status", status);
        return orderMapper.countByMap(map);
    }
}
